Fitted new case, CMOS error

[Rhyth]

Hi, I recently installed a new case and upon finaly getting the 24pin ATX extension lead I powered up the pc to a continues alarm. I unplugged the speaker as the system appeared to be loading and I wanted to see if the boot yielded any error messages. The message went along the lines of:
cmos default settings loaded
cmos error
Hit F1 to continue

I hit F1 and windows loaded fine, but obviously this is not good. So the question is after taking apart a pc and rebuilding it, is it nessasery to clear the cmos with the jumpers?

Thanks noobie Rhyth

[Splash]

if the only thing that has changed is the case then no, CMOS shouldn't need resetting. Are you 100% sure you haven't changed anything else? If not you may have a short circuit or a dying CMOS battery.

[Rhyth]

The only thing that I really changed was removing the cpu fan from an arctic freezer 7 and ofcourse plugging in more fans and front usb iso's. Other than that everything is as it was... The battery on the mobo is only a year old aswell.

[Splash]

Do you get it every time you boot the machine?

[herulach]

I reckon its prob a dud battery and not being connected to the mains for a while. Try unplugging it, throwing the isolator on the psu whn you go to bed, if it does it again after that then you need a new cmos bat.

[Rhyth]

Thanks for the help fellas, I seem to have fixed it Ok I unplugged the rear fan from the sys fan plug and plugged it in to a spare aux fan plug and hey presto! I think that was the problem anyway. I did check the battery connection (pushed it) aswell

What is the differance between a system fan and just an aux fan then, as it would seem to have an effect on the cmos settings.

Thanks Rhyth.

[ultimate]

The system fan is tied in with the bios so if the cpu was to overheat then it would give an alarm warning as it reads temperatures,it also has a sensor for speed control of the fan.

The aux fan connection is just that --a connection, a power supply.